Navicula winonae | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

39-52 µm
Width Range

7.2-8.2 µm
Striae in 10 µm

12-13

Contributor

Loren Bahls - Mar 2012
Reviewer

Sarah Spaulding - Mar 2012

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Identification

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Description

Valves are narrowly lanceolate with gradually attenuated, very narrow subcapitate apices. The raphe is filiform. Proximal raphe ends are bent to the secondary side. Distal raphe fissures are also bent to the secondary side. The axial area is narrow and merges into a lanceolate to rhombic central area formed by irregularly shortened and more widely spaced striae. Striae are radiate at the valve center, become parallel near the valve ends and then convergent at the apices. Areolae are coarse, number 24–28 in 10 μm and are easily distinguished in LM.

Autecology

This taxon has been collected from three lakes in Flathead County, Montana. These lakes are alkaline (pH range = 7.2-7.8) with moderate levels of electrolytes (specific conductance range = 140-332 μS/cm). This taxon is named for Lake Winona in the remote North Fork Flathead River Valley on the western edge of Glacier National Park.

Size Range, µm3

1001-10000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
Learn more about this

Credit: Billy Schweiger, National Park Service.

Lake Winona, Glacier National Park, Montana.

Original Description

Valves narrowly lanceolate with gradually attenuated and very narrow subcapitate ends, 39–52 μm long, 7.2–8.2 μm wide. Raphe filiform, proximal endings bent to the secondary side, distal raphe fissures hooked to the secondary side. Axial area narrow, merging into a lanceolate to rhombic central area formed by irregularly shortened and more widely spaced striae. Striae radiate, becoming parallel then convergent at the ends, 12–13 in 10 μm. Striae lineolae coarse, 24–28 in 10 μm, easily distinguished in LM. For measurements, n = 23 valves.

Author

Bahls 2012
Length Range

39-52 µm
Width

7.2-8.2 µm
Striae in 10µm

12-13

Original Images

Citations & Links

Citations

Bahls, L.L. (2012) Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains Nova Hedwigia, Beiheft 141: 19–38

Updates

Dec 04, 2024 - Orthographic correction

From March 13, 2012 until December 4, 2024, this taxon appeared as Navicula winona. In order to confirm to Art. 60.10 of the International Code of Algae, Fungi, and Plants, the specific epithet was edited to "winonae" and now appears as Navicula winonae. - S. Spaulding

Cite This Page

Bahls, L. (2012). Navicula winonae. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/48373/navicula_winonae

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula winonae from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:

ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.